Macrotarrhus (Alexiola) fomichevi Legalov, 2023

Legalov, Andrei A., 2023, A new species of the genus Macrotarrhus Bedel, 1906 (Coleoptera: Curculionidae) from South-Western Mongolia with a list of the species, Ecologica Montenegrina 67, pp. 32-39 : 33-35

Genus: Macrotarrhus Bedel, 1906

Subgenus: Alexiola Suvorov, 1912

Macrotarrhus (Alexiola) fomichevi Legalov , sp. nov. ( Fig. 1 )

https://zoobank.org/ urn:lsid:zoobank.org:act:54C1

Type material: Holotype, male ( ISEA), MONGOLIA, Khovd Province, Dzhungarian Gobi, Arshantyn-Nuruu Ridge , 46°21' N, 91°13' E, 1700-1800 m, rocky mountain steppe, 15.V.2012, A.A. Fomichev . Paratypes: 1 male ( ISEA) , 1 female ( ISEA), Khovd Province, Dzhungarian Gobi, Arshantyn-Nuruu Ridge , 46°21' N, 91°15' E, 1700-2100 m, rocky mountain steppe, 15. V .2012, A.A. Fomichev.

Description. Body black, covered with sparse weakly dissected apically scales and setae. Antennae, apices of tibiae and tarsi brown. Male: Rostrum quite short, slightly curved, with distinct middle glabrous carina, densely punctate, glabrous at apical part, 1.4 times as long as wide at apex and at base, 1.5-1.7 times as long as wide in middle, about 0.7 times as short as pronotum. Mandibles massive with one tooth on inner edge. Forehead weakly depressed to middle, with central point, densely punctate, 0.8 times as long as rostrum base width. Eyes large, finely faceted, transversely oval, weakly convex. Temples short, about 0.7 times as short as eye length. Antennae long, inserted before apex of rostrum. Scapus long, about 7.1 times as long as wide at apex, extend beyond middle eyes. Antennomeres 2 and 3 long-conical. Antennomere 2 3.6 times as long as wide at apex, about 0.4 times as long as and 0.7 times as narrow as antennomere 1. Antennomere 3 3.0 times as long as wide at apex, about 0.8 times as long as and about 0.9 times as narrow as antennomere 2. Antennomeres 4-6 conical. Antennomere 4 about 1.6 times as long as wide, about 0.5 times as long as and 0.9 times as narrow as antennomere 3. Antennomere 5 subequal to antennomere 4. Antennomere 6 1.1 times as long as wide at apex, about 0.9 times as long as and equal in width to antennomere 5. Antennomere 7 slightly longer than wide at apex, subequal in length and about 1.1 times as wide as antennomere 6. Antennomere 8 about 1.1 times as long as wide at apex, 1.2 times as long as and about 1.1 times as wide as antennomere 7. Club compact, about 0.5 times as long as antennomeres 2-8 combined. Antennomere 9 subequal in length and width at apex, about 1.3 times as long as and 1.5 times as wide as antennomere 8. Antennomere 10 about 0.8 times as long as wide in middle, about 0.9 times as long as and about 1.1 times as wide as antennomere 9. Antennomere 11 1.5 times as long as wide at base, 1.7 times as long as and about 0.9 times as narrow as antennomere 10. Pronotum companiform, 1.0-1.1 times as long as wide at apex and at base, 0.8-0.9 times as long as wide in middle. Greatest width before middle. Disk densely punctate, weakly flattened in middle. Scutellum small, trapezoidal. Elytra suboval, 2.4-2.5 times as long as wide at base, about 1.7 times as long as wide in middle, about 2.1 times as long as wide at apex, 2.1- 2.9 times as long as pronotum. Humeri smoothed. Greatest width in middle. Interstriae wide, 5.0-5.5 times as wide as striae width, flattened, densely punctate. Striae quite deep, with rounded points. Procoxal cavities rounded and contiguous. Pre- and postcoxal portions of prosternum very short. Metaventrite short, 0.6 times as long as length of metacoxal cavity. Metanepisterna very narrow, punctate. Abdomen weakly convex. Abdominal ventrites 1 and 2 fused, with weak depression in middle. Ventrite 1 about 0.9 times as long as metacoxal cavity. Ventrite 2 about 1.3 times as long as ventrite 1. Ventrites 3 and 4 quite short. Ventrite 3 about 0.8 times as long as ventrite 2. Ventrite 4 slightly shorter than ventrite 3. Ventrite 5 about 1.6 times as long as ventrite 4. Pygidium hidden by elytra. Legs long. Femora widened. Tibiae weakly biconcave, with thickened dark thorns on inner edge, with apical comb of thickened black setae and small mucro. Tarsi long. Metatarsi longer than pro- and mesotarsi. Tarsomere 3 bilobed. Claws long and free. Tarsomere 5 elongated. Protarsi: tarsomeres 1-3 flattened, with pulvilli on lower surface; tarsomeres 1 and 2 wide-conical, with dark thorns around edges; tarsomere 2 shorter than tarsomere 1; tarsomere 3 lacking dark thorns around edges. Mesotarsi: tarsomeres 1-3 with partially reduced pulvilli on lower surface and with dark thorns around edges; tarsomeres 1 and 2 conical; tarsomere 2 shorter than tarsomere 1. Metatarsi: tarsomeres 1-3 with partially reduced pulvilli on lower surface and dark thorns around edge; tarsomeres 1 and 2 long-conical. Length of body: 9.2-9.8 mm. Length of rostrum: 1.6-1.8 mm. Female: Rostrum 1.1 times as long as wide at apex and at base, about 1.2 times as long as wide in middle, about 0.7 times as long as pronotum. Pronotum slightly shorter than wide at apex, 0.8 times as long as wide in middle, about 0.9 times as long as wide at base. Elytra 2.3 times as long as wide at base, 1.6 times as long as wide in middle, 2.2 times as long as wide at apex, 3.1 times as long as pronotum. Metaventrite slightly shorter than metacoxal cavity. Abdomen more convex. Ventrites 1 and 2 lacking depression in middle. Ventrite 1 subequal in length to metacoxal cavity. Ventrite 2 slightly longer than ventrite 1. Ventrite 3 subequal to ventrite 2. Ventrite 4 about 0.7 times as long as ventrite 3. Ventrite 5 about 1.5 times as long as ventrite 4. Length of body: 10.0 mm. Length of rostrum: 1.6 mm.

Differential diagnosis. The new species is similar to M. (A.) hamianus ( Suvorov, 1912) from China and differs in the narrower elytra, a pronotum with the greatest width in front of the middle and a sharply narrowed and elongated aedeagus at the apex.

Etymology. Patronymic. In honour of Mr. Alexander A. Fomichev (Altai State University, Barnaul, Russia), who provided me with this material for study.

Localisation. South-Western Mongolia: Arshantyn-Nuruu Ridge.

Figures

Figure 1. Macrotarrhus (Alexiola) fomichevi sp. nov.: a – male, holotype, habitus, dorsal view; b – male, holotype, habitus, frontal view; c – aedeagus, holotype, dorsal view; d – aedeagus, holotype, lateral view; e – aedeagus, holotype, ventral view; f – male, holotype, habitus, lateral view; g – female, paratype, habitus, lateral view. Scale bar 2.0 mm for a, b, f, g, 1.0 mm for c-d.